World-picture of the ancient Peruvians. In "Relacion de antiguedades desta Reyno del Piru," by Juan de Santa Cruz Pachacuti Yamqui Salcamayha (c. 1620), a manuscript in the Biblioteca National de Madrid.

Hildegard's first scheme of the Universe. Slightly simplified from the Wiesbaden Codex B, folio 14 r. Reproduced from The Scientific Views and Visions of Saint Hildegard, by Charles Singer. (In Studies in the History and Method of Science, edited by Charles Singer, Vol. I. 1917.)